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import { debug } from './debug.js';

const regex = /\B\/\/ ==UserScript==\r?\n([\S\s]*?)\r?\n\/\/ ==\/UserScript==/;

export default function extractMeta(text = '') {

try {

const [, rawMeta] = text.match(regex);

const meta = rawMeta ? rawMeta.split(/[\r\n]/) : [];

if (!Array.isArray(meta)) throw new Error('Invalid meta block');

return meta.reduce((acc, line) => {

if (!line) return acc;

const [key, ...rest] = line.replace(/\/\/ @/, '').trim().split(/\s+/);

const value = rest.join(' ');

const current = acc[key];

if (current === undefined) {

acc[key] = value;

} else if (!Array.isArray(current)) {

acc[key] = [current, value];

} else {

current.push(value);

}

return acc;

}, {});

} catch (err) {

console.error(err);

debug(err, 'debugging.extractMeta');

return null;

}

}